Exhaust stack guard



FIG. 1 is a perspective view of an exhaust stack guard, showing my new design, shown in its position of use, it being understood that the broken line showing of the truck is for illustrative purposes only and forms no part of the claimed design;

FIG. 2 is an enlarged front elevational view thereof;

FIG. 3 is an enlarged rear elevational view thereof;

FIG. 4 is an enlarged left side elevational view thereof;

FIG. 5 is an enlarged right side elevational view thereof;

FIG. 6 is an enlarged top plan view thereof; and,

FIG. 7 is an enlarged bottom plan view thereof. 

The ormamental design for an exhaust stack guard, as shown and described. 